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Top Forums Shell Programming and Scripting Get output of fields starting from 2nd line Post 302770854 by bakunin on Monday 18th of February 2013 04:37:21 PM
Old 02-18-2013
Quote:
Originally Posted by a1_win
Code:
sar -r 30 3
Linux 2.6.18-194.3.1.7.3.el5xen  02/07/2013

02:55:47 PM kbmemfree kbmemused  %memused kbbuffers  kbcached kbswpfree kbswpused  %swpused  kbswpcad
02:56:17 PM 128646024  22348920     14.80    230232  15575860  75497464         0      0.00         0
02:56:47 PM 128646188  22348756     14.80    230244  15576116  75497464         0      0.00         0
02:57:17 PM 128646676  22348268     14.80    230248  15576160  75497464         0      0.00         0
Average:    128646296  22348648     14.80    230241  15576045  75497464         0      0.00         0

Instead of trying to filter away everything you do not want it is sometimes easier to specify what you do want: ever line where "<time> PM " is followed by a digit, not a letter, right?

Code:
grep '^[0-2][0-9]:[0-6][0-9]:[0-6][0-9] PM [0-9]'

Should filter all the lines you are interested in. As you use "cut" afterwards to dissect the lines you can combine this regexp and the "cut"ting into an awk- or sed-script, like Jotne already did - alas, his filter regexp is wrong:

Code:
sar -r 1 3 | awk '/^[0-2][0-9]:[0-6][0-9]:[0-6][0-9] PM [0-9]/ {print $1,$2,$5}'

I have to agree with DGPickett: you probably are extracting not particular meaningful numbers and might want to give your methodology a second thought.

I hope this helps.

bakunin
 

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CUT(1)							      General Commands Manual							    CUT(1)

NAME
cut - select out columns of a file SYNOPSIS
cut [ -b | -c] list [file...] cut -f list [-d delim] [ -s] OPTIONS
-b Cut specified bytes -c Select out specific characters -d Change the column delimiter to delim -f Select out specific fields that are separated by the -i Runs of delimiters count as one -s Suppres lines with no delimiter characters, when used EXAMPLES
cut -f 2 file # Extract field 2 cut -c 1-2,5 file # Extract character columns 1, 2, and 5 cut -c 1-5,7- file # Extract all columns except 6 DESCRIPTION
[file...]" delimiter character ( see delim)" with the -f option. Lines with no delimiters are passwd through untouched" Cut extracts one or more fields or columns from a file and writes them on standard output. If the -f flag is used, the fields are sepa- rated by a delimiter character, normally a tab, but can be changed using the -d flag. If the -c flag is used, specific columns can be specified. The list can be comma or BLANK separated. The -f and -c flags are mutually exclusive. Note: The POSIX1003.2 standard requires the option -b to cut out specific bytes in a file. It is intended for systems with multi byte characters (e.g. kanji), since MINIX uses only one byte characters, this option is equivalent to -c. For the same reason, the option -n has no effect and is not listed in this man- ual page. SEE ALSO
sed(1), awk(9). CUT(1)
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